An unsigned Japanese katana dating to the Muromachi period, measuring 61.7 cm in nagasa with a sori of 1.5 cm. The nakago has undergone extensive shortening (ō-suriage), retaining three mekugi-ana that reflect its history of remounting and adaptation over time.

The blade features a suguha hamon and an exceptionally unusual jihada. One side displays matsukawa-hada (pine-bark-like grain), while the opposite side exhibits masame-hada (straight grain). This striking contrast between the two sides is a particularly distinctive and uncommon feature.

The koshirae is equally distinctive. The menuki depict samurai figures, while the saya is finished in black lacquer and decorated with an unusual pattern of small, round white shell discs. Each disc is carefully cut and polished from a small sea shell, retaining its natural spiral center and creating a charming dotted pattern against the dark lacquer background.